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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72dd07eddeb08935a3470cb6e5e8228003964d23ba9613492287ef128ec802f' 
  AND token = 'xRdczqyN7fB7nSkIfbKfyV01gH+bZ6lF7USCo1x9E1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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