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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93236ca23492ec354bfd0906395e31a03316215bab3841247ac96347679abc1' 
  AND token = 'Zlt2ZBgMaZ5fpD1bWlIbP5lVKzL5J5/ySita4OgjrM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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