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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e7face9c13d46a852539f4f18326b35a8cc372747687b4a2c60f3aa3da67fd' 
  AND token = 'LeHOl4+PuJXLxZ5EP7laJ4Wzjpp3eAEdHW2gxuPp/g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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