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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39efec48c90cf41e9df3688b24a266fbebe7b36aa21676dc8e65252f765b8941' 
  AND token = 'c+t9ouvqv/9oN6tVyKuvRr+r/rLUGRs7tp/txr/SsqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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