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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ae10432347637d45b58c30dd43a323c91cc157e1f2573b8b93b41357c8da50' 
  AND token = '85PvurTX0iX6zqSyPibgXmGWm2NB0/b7205/TMrCGM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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