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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01da408186cc33d5d8982223234df9e6ff94d4c4614fdb5b250f2ea876f8cb8a' 
  AND token = 'prtrVfR430PcbS2PfeiomyuCeWA//at1JpwL8z+o1+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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