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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98d268df795810f55e2c802b36f1bbed9bafe4e9d26a3103de9350ed344c6c3' 
  AND token = 'kqz2J2dFwFpaP15tRJN8hgH7ygaU7EuYeZ1LTjF0NtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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