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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb23d1e6fc3879a0ba6b79ffd21ee02e68ad4c7099f78e44d547782cf15fdd47' 
  AND token = 'Swy3xu5gxNL3eYB20G2hwdrk/oI7F1kHW/eY3GRdI+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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