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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2219c7201fe148de8be1528ddbc4689f17d1281c28ada3dc6a075cbcafa23e' 
  AND token = '4lMUT7gHIY5S+XGDpJWOcs2lq5g0OaxJ8XtmAfJEQFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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