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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0d81754bdc432b253b3696d5275219225e17a6f4661b43aeb8700618c22c4f' 
  AND token = 'nNbtmeyrGejZMvMQ+b3Hq6Yya8nmgFfzR1M3lCT3tes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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