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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd725c1a625444d80cc49c3fc09b5fcd5ce82ed8ec2c3941ca4bacb43592b58d4' 
  AND token = '564EKW+BOySIPSkFLS7Gkce3gR5w0oUVIbuyPy1gi4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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