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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd976ba8fb2b5f5d7a4d1c13755aed911ec046a686249f583f2eb52caf882e9d0' 
  AND token = 'W3KZRzDQapzrlnRqp7e4MX3lxJfph5kZkCAWwJHd5Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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