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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecd512e7dc55c86103558734eb9df22d6b1435e34a783baaecb3e2d388d69c6' 
  AND token = 'LxwfS8jYI0EqDFsO6Fjf81/66TdzEDHJJzqJEQ45WDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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