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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41198736c78cd9f7f1c6f62bebfcde828b0f75dd954095a3f90d990ffac6a29' 
  AND token = 'cJib/5Hy0uV9+2WxRDDefzlcynswfkCn6p6snSVv34s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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