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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50997d4e7eea35ae1f3affed4c93079af7ac54b24e42c6e608a8a51799cd86e' 
  AND token = 'yfK41w2oOG3uNjXyW06LC6FuUcuctLxKW9cfq5e3NLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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