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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b116adf014d7147281cd0bfb2f6da20c3fc65a50777d43d45b3409b995344d' 
  AND token = 'Uc7USfNW8680BlkRt4pXTXlWRtCzI9rWzflI06hPUtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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