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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613ba926de3a947d0019b403014a3025f9316e7c9e53a1c4d40c49cb1ab7e2f5' 
  AND token = 'hzqZWNyIE7wmMKqO1zOgxfFD/DF7Fjp4oh1n3DoMbfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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