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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12b8b1c326af93487ff944f9eedb90a36c3ec1f6048c81d3b61d4ff9b302dcc' 
  AND token = 'DJY9H7aOnkVuBFyHtLQdLWxiC3lnqIwC37Pav0LvODE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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