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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeaa481c591d9d07dd47a4e6129b9d53e94c4c89a76b93b82d90ff8b1990879' 
  AND token = '3u45PoSwP29zoXqKtFEbrMLvcZAE30QzTKYK1lnCCkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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