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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c0ee57eb1633cb480bc0cf366731f05db50aed51718f93e5e5011b5e0fd0b3' 
  AND token = 'nGdNbLqccDZ1HC890M1NmP1ddZ82qJiPnq2rw9gP7rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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