SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5a53943a819e43814b166c5697d25c1dd70f5ab9a32196c93ce53ed7c257bc' 
  AND token = 'kwwiRTHPqpBz6TOx1VpgPsrC+1M/VOx8TCuC4K3QeZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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