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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff748df73e46d2d33c3717b97f49edc0498ad7d2585f9a3192de08825f00031' 
  AND token = 'CAvWj14SPYyAbUVS+AyFqGBK6Y6ed8eDRRRVa2BjqYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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