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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d7987da28fe62f34a99b3c2967eb6471d45255df9646752c78ca3822277ced' 
  AND token = '4Wg/wm4PlzWEbqr4pzmbJTJ6bDUEaWYZPDcIf6rTp5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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