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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c76d6c60ec5086ca73c15b66fd87d7ce8db14bbd7003cff4cb2ab0613e55b2f' 
  AND token = '3wLafYL7b5mEYOFIFfJlPyogZODeMC0yIqaunKCgYtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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