SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fb8a60861783225c2fcbc2ab75916ed985c709a6c9435f1762b5e94bdf28a6' 
  AND token = 'iivQozoX605QWY6O/bDr+gjSBk2d0e1ghwbu4UWKiCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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