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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a463170a5dfc2f13d4a1b3bb8e016b0c83714b177c822e63b9c46892e5aad5' 
  AND token = '192E4HWp+SxAjm2r+kiUCOkLYvaUlZzHn2DsObohHis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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