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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50123fe818882752588379ae6623e23abecd993d734d29c7ebb9c30a99ef5eba' 
  AND token = 'y1zFBhFvY6p9G3VIWDmy6NLLTHQX6Ne11/3O4L49qB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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