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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1fb28cd8b3b3f94f1973c35072b917cac27113d0d7058cc1102d274044430e' 
  AND token = 'Pl5gvYT70JiE3Jt/PglTK96/8wwJ458CFXeW4y5yaOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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