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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6293f10d1bb920ec663d6c6611ffb75f355682847340164617868b9b3fa67f1' 
  AND token = 'tK4beKk0XHHx4/lm3/2Hnf0+HeJL0eqgr/vmKKaDf1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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