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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3199562429122b3dc26b5554bc3384008f64a53058eda92f7f8962f972fe97' 
  AND token = 'NPHbu/FwQ/cSWsighBL7aY9Z0D26o3yAP35ty7B8xTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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