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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5650173be7ad848fdfd75a467048ee05ffb6d6fba07df9f7efa8d29bca26bc33' 
  AND token = 'VaruGhgZN0KPIVSx5OMp7JN2V2HalR2gh8iE/GM27Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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