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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e974c830d0ee659d79bc3505295bf9fb547b082cd2368f28a82302b076d48e76' 
  AND token = 'Hk4jT26Tf+gQneMoGn1UsUM1Yl904XoCig82neA4ceY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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