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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1baec2417d88884d0ace6bba8ec74fc96c8120e41d574094f547f5d818a6438' 
  AND token = 'Oi6CZb/WcXFtaeaLETKFD/2wfE5ZocYanHdv0c6/po0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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