SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319a32ddbe4f16d62e6f3801e2f3b266518b91ad7b27a6c33db78b89529cd4b4' 
  AND token = 'gXC4NoWXwuYvDTYzArVW9zJ4bIqrgI/oNVUS3uF5omw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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