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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f061d3785ab1df3e5b6df02d53bb8d1531e8e54dce7fb93ac1fbe9c898998a3' 
  AND token = 'ccIrRCqpcsbwnPqTrQTI5T4qRTC/jFtex0TTREASZ00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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