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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee5f55d6c7aa39d3d43f97b21a8ba122fd2b016994880715134f7d0a6323d5e' 
  AND token = 'QNp6DPvIeyNQokWp4dUgOSipc4Zpbxs7w8WEFXwzU9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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