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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842e9c9ac4dfedfc8a6fe830e6b2c56b634f317988daf2be78eeae8a7736cb56' 
  AND token = 'sYi7PUctkAH3rq8Bj8RLR3yPGOCOHgwAFoNV3rgfPLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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