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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985ec0907d16c0e85c91327d9a93f01ceca3eff40444d1bf94bf4afe772feb66' 
  AND token = 'V2YYIiJIDpgf9updxI211KeC62/xvdggcU/KF4wkw88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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