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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d48144cee115905ed46e9203206ee48465cd613c437f89070c25431aa8cde6' 
  AND token = 'p3jFGHpVIeuJA6sdiCOpaw0Go0sNpyPfDg3TFtlfdy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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