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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f23fb17de1f7f911481f164d9c1c7458e3f6c46c075ea132cf5fd55a16c446' 
  AND token = '9x1YXqnCdbTfXA6AmWtkyywIjGSiDDUwHT5Jz92s+Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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