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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8db20bc95ab7f1e8bfad89af215684dced2822750b8be092f2c0c8e7d771dfc' 
  AND token = 'K0EqFfmxt+nGz62dvmkxSFjhC/ypZnPrlk9ZsThx280=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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