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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa7ffde3bb6a0c67e06a94f64b6dfe54e620aa750a6c9d276fee1348f078c60' 
  AND token = 'h/bzg6IJWeOj0gUf5+3QoI82iDoTYIlkf6aVIfzYCXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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