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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be06a828689e95b624ddd35f46ef62c2b27f3429f84e781933bd1fe4aaf3d88a' 
  AND token = 'tdnLoBAyiayfepbh+jhY/SXwWiHeFBB8DC5zjpOIn3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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