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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bb76bc80100bc83c4028438323269e563dfbd107949da847dbae2dc770911b' 
  AND token = 'JgOcHOF2WDa6DL+hfmnveBO5ms3sSWAwPEdW/LV3ruc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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