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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882f52c43079ae1972244575654c35544c0aa2dfbdc4622f7a47a43799ea1c69' 
  AND token = 'nEHPUSsMMjRX5ipbgj47NffaN6iuEw4k1h4ZxVzlf/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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