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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c611bafe5500ac67d2f303a8a05175fd208eb4bbf6eef46923791cfd3028543' 
  AND token = 'LiRMEmJWHgGyctviSuNgLgYtrODsZkIpzQsi2SfG8j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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