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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca82554ab92e0fbbde7c494eeb6d6d522e9d64ef3b0269957236b3c06ca67e7' 
  AND token = 'gleEmyY47py+4Fn89AW1HFdYnxcLtc0Oga0VKUGNwaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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