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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5ba2aeb15e2b7c579300d7b29183891591716957c2d61389fc685b5c08dfad' 
  AND token = 'x2eGrd57P9dS8VJ6G9yXqdRWA2etqCbKKwm87XUKeoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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