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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdaf692a72ab8afee7f5862791e3a21661cbdea4b3a080de8d5112e4caa5e4c' 
  AND token = 'YNhK9CZyTqUuZlNcOLTiO9thNKqXEWQSmLqivXkw5iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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