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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20130aa3149bd5863f1f128bf0407f4be3e58a5b76190bc964de1dbbbe3e074' 
  AND token = 'IjoLy0TVPRvTGhoMDy2gha7oddGDaZULhZZQlL9AhXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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