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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5538b6db5b129da0ae97b07213737ee44f53ba5474cd973827754edae654b57' 
  AND token = 'sQrWfAYIxLJfSY6M08/p4fjetNCcUUS5j3FSUBw+Mv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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