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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eca615eaf34c0e190f99ee76c8ca3c65759fe5de4846a12f57c20d88fa9386a' 
  AND token = 'gr7cxmhYD4emFWxq4w2xiq/LvJbWi/p+KsI9doq0K6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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