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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece854def6f8c19e2bfebcd6bcaad5300d66ae8598835a7a8aba944165a065b2' 
  AND token = 'fd6rg8100b7uwltAT/ZPz8wcPDJHCwa66gYUzXLQAwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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