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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994c6223d9a4481c7705cb4ffe2eb694cad109d4dd7e7f5b551c5d40fac91659' 
  AND token = 'tBZB3L9f41SSAlsf7Sjl2ZpXHfCDOjguJt8vyJ/PZsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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