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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da58ec114cd2bb6f7c87d05acb77e62b8866d63bb922c586b6a2fe872c509300' 
  AND token = 'bYeyo2hURSIVMJTRM3IUlUJIu2/wSg3CKJyuX9oDUyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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