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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1645dd6cb79a0d7e6f7a0c4ce289f41ef700cc3e7c5c0ad8228fb5fc04a715' 
  AND token = 'OtiiRXhgGfEmfIH8cvb9HkP5f6d49oo1039dTMQJ3Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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