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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6d1aaf869f322ad6674006e4be3c1fc6ac01e4a04b0bf3428e86cb08cd2d8e' 
  AND token = 'C3HD+InpDXEYLGH2UmscDDzZL2H9FPrJHyyTqOFpguU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}