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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2900797404f1ff33e5215f28bec14b8dec94385e3185bb4c8489c9f86dcf4c43' 
  AND token = 'a356rwUj6BGvNEhN5Zk8F5KsIOEzVTbBzbN654MB10U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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