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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c0217ea2bca9ba241df45327aac3d14a8269fd7b3b8b8d71b21f44e3b2ba3d' 
  AND token = '6OgV/WQHDu3GGSV42bBeJnIdceTzCb1Fikxq4NvbFuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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