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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a9b7b0dcab960fa2fb83eca70b226ffeced8723d7ea7bfa57733880a63ec05' 
  AND token = 'PlVmyIJheJPHdWhVFvhNY16Ums8++zsM6L1qUWkCUGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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