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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4ddbabadf36ba12ee188b9f974ac20c9e1ef63526e2d1f8bc3fc09e9162b91' 
  AND token = 'AR9uH/ARybipeVF83ts867jc19IqMjtUVNlwVpANo+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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