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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88618aef3dba341d0715d04d48a0baaadc7e843a01d53efa7d467877f4ff6fdd' 
  AND token = 'GBA25+aZRvB3dmi0NM9k8OgoOwdvjn1d8h23q2Sqdns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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