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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d14dbbccbfdd47d6b6ced7b605de3385e52988c538cd13907cc75f3ec627fb8' 
  AND token = '3kBgIacipwUm9svLsinkrzgMmf7Ryci8a5cBp5UrV/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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