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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056c30b83ec09e5ac90642b032395415505f3a3904c19070159186a035805810' 
  AND token = '7DMQPRJJS2mA4zpfLwHVZuCDjyMLkxXHoUt6DJ6g5IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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