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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48281c75de8ee119639137ef37388fe4f238bbbabc5bdeeeb2ce777d27c8a5df' 
  AND token = 'CdXImv4nsJmy7jmmSV8hJ8rPGtaQHxc55BSa0ZNrt4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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