SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ba09838a6ac3e1d3fd2f9059e8151117bd7436602ecc8ff0ab66ba986c9290' 
  AND token = 'I5v+RPmYjRBmdf6VZS8JhxcQyDwN134c3oPPVJKFWSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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