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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503db9efd98891ee641366787f29887db6f611dee3d629aceb6affd1161254ed' 
  AND token = 'mU2Wj5hIC9VKhtKTrBKP2QppatIUZb7Ie6MVF3kModM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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