SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb64da09e45404f65617dfe69d42b2381ded89a47eb02e8120a362a5f866fb8' 
  AND token = 'AoXJaLiossHHFCGcUWSE+u/fauljRZnzLK1v7+9DMJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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