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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd005e004025de76449a61c3b778494ece279342b5ba671eaabe78a6afcd91d0f' 
  AND token = '9Jllv5rLKnObpRhu6pYbwJdW2G+mBUM2xtpnywuSyo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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