SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2606ddbbbad09a1b8a47c5084bd88e291455f49b0182f69bc8d9c7be3069fd3' 
  AND token = 'UxuYGHVG0FEvy849YbCMYZPQiamVpGnswFhHs2Rrjzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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