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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7d27536b7bc593ad8b41109b0a3f5d867ac15696acfbe551ccdae9d99419dc' 
  AND token = 'tMZp/qets0/ZoPl61A++HEdCHQ90n0Qo7koe/QTS27U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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