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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefa543e0f67a82e41dd87f6ffa96149fb573e48b2feb6b9933913af459add5c' 
  AND token = 'xTH6IUG02N2SVYBPuH3qubnizHMtQVAl7ynFcJSdvpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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